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With the arrival of summer, you will begin to catch glimpses of a small but speedy bird in flight, looping through the sky, searching for insects to eat. Its underside is white, and it sports a dark iridescent back that flashes varying hues of blue as the sunlight passes through its feathers. The tree swallows are back! The tree swallow is one of several swallow species that come to Alaska to breed. This small songbird, weighing around 20 grams, arrives from regions as far south as Cuba, Costa...
